It would be interesting to see how your body is mounted . Do you have any pictures of what you're dealing with ?
Tim
Sorry, no pics. But don't worry, it wasn't on the road like that, just a non-running project with lots of loose parts.
Suburban and Panel truck mounts are the same. Check photo
Driver's side frame rail.
Photo 1 Body mount drawing
P2 1st mount looking forward
P3 2nd mount looking rearward
P4 3rd mount looking forward
Both rails same.
Thanks for those pics! That lets me understand how it is supposed to be.